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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c408ad8952538dcf48275cdbc629ba863230eff38700a6a8e1a9f76baa0b3885' 
  AND token = 'dv8vA+BodqE6RNBB8oToFjSiU0xrsrt/WYm0SGySbSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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