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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195c0e6179189ae505cf76500303742f2b968e6a42f604ae8d33be863cdad20a' 
  AND token = 'VSP29zDMmrHYE6o7/tPrF2qdwM5PbBzgQfx5+QFH8PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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