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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2c39e564c664913c4747db897415ad9b6db7857ca78566d857f0d0149d8757' 
  AND token = '9ASdCWarqQxXuXoRFuBbzL5UPId9N19jepSD8Diy8e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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