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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0c56b48cdbc19ded927bd60ba64756838480cb086bba3112c6d0b75bc4654d' 
  AND token = 'ieN3jGWuc7lFVdxZtEoWie9PK9pyB1ruBvNodZgNJ5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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