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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80c474893bde3b91cf2df9df7874e83087ba5570428659565d8c4c8779c58d5c' 
  AND token = 'ACPJynMf2+fdwgB+zHtsuoTsrvE7kickEAgVR7a0G6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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