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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b81d40a976a11ebddfe048351112c63b35ff48b6855342285653214c3341bd8' 
  AND token = 'NtXTUSjm2BM3umKfrYG5U0eL15OGs6uJ+p2AAsgMTD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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