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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8a62268e6839ef92519649485aeb4584080b53036745c35e0fac24cf050872' 
  AND token = 'DLyzgDEMJfWbs7jH4JirwVF2e9jZLvnGwrsSr/DFR1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.07985

JSON explain

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