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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70da77dd1dba437c217669a3f39c116be49c49b57b6c037b20d7fc0a00149dd9' 
  AND token = 'nGJToIqhciOnWii1c2BvFiROkxaGKDZ+E7tUHAcF7iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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