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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9dc230f441818a2d3e75d254e42914c2679f8b836fda6ca3284cc0ac7242e1b' 
  AND token = 'FFOCed5G25ExFFKVKkdbHCM67wU5qcQrIRaTnfqW4zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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