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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769b8eb2f55e57501440a37b1f8d821a7b30282813a0d7088842a9a8e32c5cec' 
  AND token = 'OH620IXcyDgPUVTEYCGbrF4llaZtza7bJ7+Mhxqc1pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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