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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361565984ab24382ea47c6db5680d0d031b33b7e6adb1c181dc005590278397d' 
  AND token = 'EYg5yx7xJEYCQF5nQPO/e4MgEYK/zDSwD90HcueNxOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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