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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a968ba3ad507080cd1519e57091c45f84ced1824ef8d83bcdcb67a0e526b29a' 
  AND token = 'B9HnTGgtCHGN5YC2fo2ekbsmb3wxLVbYgRUBM5r112E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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