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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f74eea55211537be63a061d4af8fd7b065c867d1a4aa566791be3c9f8cfaa932' 
  AND token = '/lYDbfe8L5To/uPOcDRY65hcVTicOCd4RS+rjGLs9JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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