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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6987a4d6bb8a115f8f88eefee5f7dd2db96e04a97cff82ac69922e5df7015f11' 
  AND token = 'aV2JFNn2+jTsy5Gljsx8XnbArqvA8SCJkGpa1KJFGFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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