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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3f1cda98a1ef453944014dfa23cd800e954d754ee0fe387b9791701e77a3cb' 
  AND token = 'fY1IW6ULwgDZP5LhQx02qszRpqyPf9TAA+xa1vt2TCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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