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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca61af2a083f78d7028fd1451685ded6edd02bd99e307f73835c2a6e8384aa7b' 
  AND token = 'IFFtWgOk98hVfUoNSaPN+cWDGLFe4kzd9LDjpRykTkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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