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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83a3416c99df896dfd6bf122be9ca3aa0ec76d3ba8267ea919912d32daaeb82' 
  AND token = 'uhsMrnpuJU+4pF7IN3eDJGM3HF7m4/r0fummz9Pu43w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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