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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3630293dcece45db2dba18c8f964e8d51ca6ee5951a3e799e3cf3c06431b33' 
  AND token = 'LI/Q/BoBzF+PW+rFvspK2UFJ8NAGRPpu7e9EDgektD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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