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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5029b2db2223882228633c7bf388783de3b81c22bd9cf8ea51a93ddba04a67' 
  AND token = '5wHw8T+jiw1J0HUwRZmfWhAwrhX3ZeCjRTvHgJA3dSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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