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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d7cf43d8c47030efe05f288b0bb9ee7f6752c3ce2f16d87698323cf42c35e6' 
  AND token = 'tZUiZS5zcVh7wQ+lux5Rl8Ypqa8r60ESonJBaymDQQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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