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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8703fd0f129bd3e295006201131deb1e6552be23cc0bcfc0cee96b5d4b1cc2' 
  AND token = '19KaNsqk9i4VvHbVygQBCk57G/OaT2xOVGCgArVbcxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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