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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca468527ab7a60617e8031ba21fe2327de9a8070ec9a8271caad19de0c3bba29' 
  AND token = 'iNpJq68G5VOMsgReQmo/ceR4xmlMWZSC82Iuc57g1SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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