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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b617be2ce8786a0182dcdbee64dbd4bfecfff96374597522a01da11af22c4658' 
  AND token = '1RyeolKAvjm/pX8CuCUvmncpHal9rlYSDxi1P8oJ0dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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