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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6accdd17799c3f7013fd0754e2509dca29783686267e4d3825c0895d5574ce2e' 
  AND token = 'i7iBkMKZ2cLO5e24hekydbhFXX3J8vVpH8SnIaLbRGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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