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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc1e55039d7a780db4fba993d77a7e938012038b8203faffdfbde1dc564e5ad' 
  AND token = 'AAh2YjDlXMB1x//tqsXka/8lSEQgTpfIquRIHuYzY1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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