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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c964d1897a7fb40e56a722b6f73449056df35022e3d6bc774145fc3637499b' 
  AND token = 'zMCIG0thk3uQU9V8eMSPxtmDTVNQWoif2lM5uPScLLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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