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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50867bd6a8a103602bd8ee473a1ef20bf3b0ba1f2920b6f0093004946e5cf6a2' 
  AND token = 'xpJWDXKaHI1gdH5LUvA7ZoJ8G4kQGy/4WbAmc3s7W3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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