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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615cd988e7bbdb8cd4f8b970609d8d18fa09ebfafd6ea7cdc9c254fc11d2e744' 
  AND token = 'TQ4IILDmYapf5/4agD6nIFVc6KpLA5S2d0s3Yq4DhQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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