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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc177850e37d83f4bd7a330a4f4b4eac6943ec4a69663e7576b14dad4e06e2f' 
  AND token = 'Cahw9pr/QS68LpZmrA1OHkhNh8uXnGEzA6zBBp9ULlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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