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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc47ea43b78f5a120d72722727a02152e5490c6d67ae7503cf059df13b8cdb2' 
  AND token = 'LzuCsa1pEL5auK5kRbTiCL3/kW3RphDVFULkKJHxRpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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