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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85b46d5a9eee4961e29c47e1ffd156edd186e877b0e039eb26c88336522c6dd' 
  AND token = '6MPBTRpBQxV0K/TCs376dC+m8jpJu/5DfCwyZl2CxE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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