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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c07d5baee1f28c7419ba91e9c9c2c48b0b44adec340e85f14ec7383c706410' 
  AND token = '7FHjLAPTnirxqA3sweVFaRs/9XpdGY1FG11t4NwF7qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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