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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44973ec36f728878e8755953a536c1bb15126201d6fa5c9f38f6b7aec8b0ba52' 
  AND token = 'mWLA+c+XB2s0bLABslJLO51YXxOtfYuu/UBMBzfHzsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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