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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c126675f1299a96c4b19a17fb06f52f6d488c2526599a979bce4c6ca3acd2119' 
  AND token = 'ZEesranJuiCtGVGCVK47/ymq5wvAY8gZ7cdD19HbjOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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