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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6df5fc9b4ff3ad6a2fa4ab929865a6e9e1b7832652eb3e02c77af5ea161e29' 
  AND token = 'MP40uv/j7E0lDxfAD5APmTjX5575b3wo8sJdoudqQt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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