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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ebe4044c09ecaef9abc9cfcbdf7153b05f593cd75ffd536e6f1eafd722b425' 
  AND token = 'VuBe1+xoP+Jt4s5VU8opIa+t7R8z4wYE40Y9Y32yJ34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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