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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39ee36a9b30458f7909d8c1490440ff3f022c0f9ec83989627c8538762698d3' 
  AND token = 'sebVwnRtECdJQkvDTNfgq5WQDXknL1g7F7aQrFWtc78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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