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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c162749f4f4df97ba21274dc977b775e0bd0abd2c368979e6b59b607935d1dcb' 
  AND token = 'BWMo4hHHBMFxEQbyo61JfZHYf5Bw5oAv8KsoCza8omc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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