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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5693fd0c30b9545817720625faac6a674f4a4a1a7dd0a07a30c322cda86588cc' 
  AND token = 'pPdDVp0NKEhp5rrG98gaBk0XcZhbyvR8ZW8SNt7hzOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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