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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17aac3a30a586211366603c0e61d488ed3580478f5e78f2b7a4b370ae3daea31' 
  AND token = 'BIIEirCfPy3cAdhvVSkoI8mKI9gnomzGfYzGQt+5Iho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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