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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '348699bb6f59132e44be4076448df8465fbad08a4ef567eac413ad2d2d6711b6' 
  AND token = 'STXqxen6C0+Iqojjg83I11jieQ/sT+p209G8k5admDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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