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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2b0e9f3a72748784de7e9769bfb74c0e27f611b1f13a3084c6f41001167757' 
  AND token = 'Uh69ylL/mKeYx38oqecX0fd8fad5N6NgiqMvAMl2JN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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