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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd25695e54c0e2f5f94a43b5b0617b8b30dde0b71445c00ab6ad7ee8dbffee8' 
  AND token = '/sY9RJOypf78yT8ZdwD7aX1myR/pdjeadrEokGlk9oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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