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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052e3327604f1c9c7409ef73bd9da248a7b5e4482fab153ab427fa4cc855580d' 
  AND token = 'YGamHJadwMmk7OhstnEa2E4fXr6K47LHPFAB9Sp32VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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