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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4bd174a61a3c5390fa90926cce8a7168f43f1af200ee0c593b6fef64558f1a3' 
  AND token = 'rN2+o2uMDYfApPdzX3gdKMiLe3ZDQ2HygAKLilGve2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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