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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4269143327ab4091b50548d89107f9d369161a527ce5211575aed2b2ed8411' 
  AND token = 'lXOvkboAPjQsJ7MKBTl0zk5vsnbG/gwRKIpNedoag1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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