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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ad8d11216e96abe3a30275cc435a82f5bc6129006bd387047784f32be767f0' 
  AND token = 'Dgb+8lYlXjbxJXdG5M0lpx9dl3WVoG5jLzWo1wqA91g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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