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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6629fe90d0b77cf56127d57e385ab77b21bd7de0befe32c0ae7a02bed937c47' 
  AND token = 'fHbN6qDzTWUVjLOzE3iMmYSmH/H9beB+21P46WL5SNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}