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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff1e68f5b261a5391bbf2a34854fe60885be70fdad18b908d3bc037ad9d9972' 
  AND token = 'sQ8PWMi02uDIpkFVYHglDgf1r7U21dbRlhej8ld5e5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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