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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eedda993730a65e3daf6efcfe4edcf7f9c32b99da5ee44a5d468416789759b1' 
  AND token = '89NT1Mun2XnG6sKfV+zjtwcM7cXQh86bHyyQXhwIpWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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