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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c9ff13763362fb1ad2b5901bf1420aaf1670346ff897277a1add25e7c50290' 
  AND token = '+6McQ9j+8B6iX1KpB3ck3O7G6Irop5pmLer5PedhJUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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